YOSEMITE NATIONAL PARK, Calif. - Anthony Frost was just 200 feet from the summit of Half Dome when he lost his nerve. Then he almost lost his lunch.
"My heart was pounding. My boots started slipping, and that kind of spooked me," said Mr. Frost, a teacher from Bakersfield, after he carefully backed down Half Dome's cable route to level ground. "When I looked up, I started losing my equilibrium. It feels like you're falling when you're standing still. ... I'm amazed I made it halfway."
Half Dome is the 8,842-foot-tall granite monolith that stands at the head of Yosemite Valley. Its sheer northwest face and smoothly curved shoulders are recognized around the world as the symbol of Yosemite National Park. Climbing to Half Dome's summit is a 130-year-old tradition.
The park maintains steel cables that enable intrepid hikers to climb the last 900 feet of the route over a 45-degree pitch of slick granite - a slope too steep to climb without assistance. The trail can be an acrophobe's worst nightmare. It helps to bring work gloves, shoes with good traction, and a good deal of brawn.
In 1868, about 15 years after the first tourists began arriving in Yosemite Valley, geologist Josiah Whitney surveyed the area. In his report to the state of California he wrote, "Half Dome was perfectly inaccessible, being probably the only one of all the prominent points about Yosemite which has never been and will never be trodden by human foot."
His statement remained true for just seven years. On Oct. 12, 1875, George Anderson became the first man to make it to the top. According to an account in naturalist John Muir's book, The Yosemite, Anderson, "an indomitable Scotchman," hiked to the Saddle, an area between a small dome and the eastern shoulder of Half Dome.
Picking up at a point where others had failed, he "resolutely drilled his way to the top, inserting eyebolts five to six feet apart, and making his rope fast to each in succession, resting his feet on the last bolt while he drilled a hole for the next above. The whole work was accomplished in a few days."
Anderson's fixed ropes were eventually ripped off the mountain by avalanches. In 1919, the Sierra Club paid for the installation of the first set of permanent cables.
The present cables are raised waist-high, attached to metal pipes set in the rock. To protect from winter storms, the park takes down the support poles each autumn and puts them up again in the spring.
On a warm and sunny day in June, Jenny Owens, 21, of Salinas, and her mother, Julie Rodgers, of Prunedale, arrived at the base cables after an 8.2-mile hike from the Happy Isles trailhead. They took a look at the steep route and then paused to ask for God's help.
"We said a little prayer for courage and strength and safety," Ms. Owens said. "There were parts where it wasn't so bad and there were parts where I was like 'Oh (no).'
"If you're afraid of heights, don't look down. Hold on tight and take one step at a time. It was the most challenging thing I've ever had to do."
Each year, thousands of hikers stand on Half Dome's 13-acre summit. The park doesn't keep official numbers, but Mr. Snyder remembers one particularly crowded day.
"On Memorial Day in 1972, more than 700 people went up. It was horrendous," he said.
If You Go
GETTING THERE: The 16.4-mile round-trip hike to Half Dome begins at the Happy Isles trailhead in Yosemite Valley. It gains 4,800 feet in elevation as it follows the cascading Merced River upstream, passing the spectacular Vernal and Nevada falls along the way. After a mile, the trail splits in two. Most hikers go up the more direct Mist Trail, a steep and wet route next to the river. The John Muir Trail - 1.5 miles longer but slightly less taxing on the legs - is the preferred route down. Visit www.nps.gov/yose/wilderness/valleyplan.htm for details.
CAMPING: A wilderness permit is required to camp at Little Yosemite Valley campground, 2.5 miles below Half Dome. Visit www.nps.gov/yose/wilderness/permits.htm for details. Black bears are a nightly nuisance.
TIPS: The trail to Half Dome is one of Yosemite's most popular. Allow 10 to 12 hours to complete the strenuous hike. Afternoon thunderstorms are frequent in the summer, so aim to start by 6 a.m. or 7 a.m. (The Visitors Center in Yosemite Valley posts a daily weather report.) Take leather work gloves to grip the cables; wear hiking shoes with good traction. Carry plenty of snacks and at least two quarts of water. Do not leave your pack unattended, because golden mantel ground squirrels will chew into unguarded packs and ravens are adept at unzipping packs. Hikers have lost valuables discarded by ravens rummaging through packs for food.
FOR MORE INFORMATION: www.nps.gov/yose/home.htm or (209) 372-0200.